You are creating an ASP.NET application by using the .NET Framework 3.5. The application uses the Forms authentication mode. Each folder in the application contains confidential Microsoft Excel files. You need to ensure that bots are not allowed to access the folders in the application. Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A.
Map the Excel files to the ASP.NET ISAPI filter.

B.
Add a <deny> element to the <authorization> element in the Web.config file.

C.
Set the authorization node of the lockElementsattribute value in the Web.config file.

D.
Implement a Robots.txt file in the root directory of the application.

E.
Implement a Completely Automated Public Turing Tests to Tell Computers and Humans Apart (CAPTCHA) image control on each page of the application.